EM3242 AKM Semiconductor

EM3242 EM3242 Angle Sensor IC Applications Small absolute rotary encoder Small input device (mode selector, volume control, and soon) Potentiometer Rotary switch Features Si monolithic rotary position sensor IC with embedded Hall devices Contactless rotary position sensor is easily implemented with magnetic disc (radial magnetic) and sensor IC. Analog ratiometric output (10%VDD 90%VDD) 10 bit Angular Resolution 3V single power supply Extremely small temperature drift (typ. +/-1.0 degree) Ambient operating temperature range: Ta=-40 to 150C Package: SOP6 body size 3.63.00.95mm Block Diagram VDD VSS HE X 10bit Angle detection HE DAC Buffer (Mixed signal Preamp AOUT processing circuit) HE Y HE Sine wave ROM PDN TSTA TSTB <EM3242 Datasheet V1.2> 1 April, 2013 EM3242 Functional Blocks Block name Function Hall Elements. These detect X/Y-compositions of flux which is parallel to the IC HE package surface by using magnetic concentrator. PreAmp This is able to amplify signals from Hall elements. Angle Detection Angle Detection makes digital angle data from signals from Hall Elements using Sine & Wave ROM. Sine Wave ROM DAC Digital to analog converter for angle output. PIN Description No. Symbol I/O Type Function TEST dedicated PIN, which should be connected to the GND in 1 TSTB I/O Analog/Digital use. 2 VSS - Power Ground PIN. Power down PIN. IC is active in the case that PDN is High. IC is 3 PDN I Analog power down in the case that PDN is Low. 4 AOUT O Analog Analog output PIN for angle data. CL: max.200pFpull-down Power Supply PIN. 0.1uF Ceramic Capacitor is required between 5 VDD - Power Vss for stabilization. If Capacitor has magnetism, separate it around 10mm from IC. TEST dedicated PIN, which should be connected to the GND in 6 TSTA I/O Analog use. Application Circuit Power Down Input Analog Voltage Output 4:AOUT PDN:3 Power SuppAlyn alog Voltage Output VDD(2.7V-3.3V) 5:VDD VSS:2 0.1 F TSTB:1 6:TSTA Locate close to IC *Bypass capacitor must be inserted between VDD and VSS. <EM3242 Datasheet V1.2> 2 April, 2013